TEA
ROOM
SPOON
ICE
SAND
PISTON
Just-poured tea
Bottom scalding, top drinkable. Tap to wait and watch the bands argue their way to one answer.
— °C
NO SINGLE ANSWER YET
TAP TO WAIT
Ask "what temperature is this tea?" right now — there genuinely isn't one number that's true everywhere in the cup.
A room, AC just switched on
Corners disagree with the middle. Tap to wait.
❄️
— °C
NO SINGLE ANSWER YET
TAP TO WAIT
Every corner of this room would show a different reading on a thermometer right now.
A metal spoon in hot soup
The submerged end is already hot. The handle hasn't heard the news. Tap to wait.
— °C
NO SINGLE ANSWER YET
tip (in soup)handle
TAP TO WAIT
Metal conducts fast, but not instantly. For a few minutes, "the spoon's temperature" isn't a real question.
Ice floating in water
Genuinely 0 °C throughout — but only once it settles. Tap to wait.
TWO DIFFERENT ANSWERS RIGHT NOW
TAP TO WAIT
Both readings will land on exactly the same number — and it isn't the average of −6 and 18.
A shaken bottle of sand
Shake it, then let it settle. Only one of those states can be described in a word.
SHAKE IT UP
Shaken, the surface is chaos — no single "sand level" means anything. Settled, one word does the whole job: flat.
Push the piston — slowly, then fast
Drag the piston down. Go gently, then try a fast shove.
Slow enough, and the gas is uniform at every instant — one pressure describes it the whole way. Push it fast and that stops being true, even for a moment.
Puzzle · The Refusing Thermometer
An uneven metal plate
A blowtorch hits one corner of this plate. Tap the torch, then try reading the thermometer whenever you like. It will refuse until it's honest to do otherwise.
— °C
🔥 APPLY TORCH
📏 READ IT NOW
That refusal wasn't a bug — it was the correct answer. A single temperature is only ever meaningful for a system in equilibrium. Everywhere in Chapters 2 onward that a problem says "the gas is at temperature T," it's quietly promising you this state first.